A) $ Fe_2O_3+6HCl\to 2FeCl_3+3H_2O $
B) $ NH_3+H_2O+NaCl\to NH_4Cl+NaOH $
C) $ SnCl_4+HgCl_2\to SnCl_2+2HgCl_2 $
D) $ 2Cul+I_2+4{K^{+}}\to 2C{u^{2+}}+4KI $
Correct Answer: A
Acid-base reactions occur spontaneously.
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